Patent · US Expired

Ceramic dielectric material

US4054532A · kind A · utility

14Cited by

12References

23Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Leopold Hanke · Beyharting, DE
Guenther Hoffmann
Helmut Schmelz · Prien am Chiemsee, DE

Key dates

Filing date	Jan 23, 1976
Grant date	Oct 18, 1977
Priority date	—
Expiry date	Jan 23, 1996

Classification

Technology area (CPC H)Electricity
CPC primaryH01B3/12
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A ceramic compound having the formula (La.sub.x A.sup.+2.sub.1-x).sub.2 (Ti.sub.x B.sup.+5.sub.1-x).sub.2 O.sub.7 wherein A.sup.+2 is a positive divalent element selected from the group consisting of Ba, Ca, Cd, Mg, Sr and mixtures thereof and B.sup.+5 is a positive pentavalent element selected from the group consisting of Sb, Mo, Nb, Ta, W and mixtures thereof and x is a numeral ranging from 0.70 to 0.99. This compound is characterized by a relatively small temperature coefficient of permittivity, a relatively high insulation resistance, a relatively low loss factor and is compatible with relatively low cost noble metals, making it useful for forming dielectric elements in monolithic multi-layer capacitor elements.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.